Journal
ACTA MATERIALIA
Volume 79, Issue -, Pages 66-73Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.06.004
Keywords
Magnesium-rare earth alloy; Solid solution; Segregation; Grain boundary; Scanning transmission electron microscopy
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- McMaster University, Hamilton, Canada
- NSERC
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The present study validates the previously reported investigations about segregation of rare-earth (RE) elements at grain boundaries in Mg-RE alloys and ultimately provides a direct visualization of the distribution of the solute atoms in the structure of a Mg-Gd alloy. It is demonstrated that Gd forms a solid solution within the Mg matrix in addition to substantial segregation at high-angle grain boundaries in the form of 1-2 nm clusters, with a postulated face-centered cubic Gd structure. The results suggest significant implications for the texture development during alloy processing and recrystallization, and thus for the mechanical behavior and properties of Mg-RE alloys. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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